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AutoCodes - Generic - U1121

U1121 Code - Lost Communication With Electric Stability Program Module

- Code Popularity: 20,746 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U1121?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Electronic Stability Control (ESC) Module
  • Electronic Stability Control Module harness is open or shorted
  • Electronic Stability Control Module circuit poor electrical connection
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How to Fix the DTC U1121?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1121 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code U1121 Description

Several control units are applied to electronically controlled vehicles. These units perform each control with information from various sensors. Thus, sharing signal information from sensors is needed, so CAN communication type whose communication speed is high and insensitive to electrical noise by spark generation is adopted to controlling powertrain (TCM, ECM, CLUSTER, Electronic Stability Control (ESC), 4WD, SAS, EPS). CAN communication consists of CAN-BUS HIGH, CAN BUS LOW, and two 120 ohm resistance in the circuit. If the 4WD ECU doesn't get some ESC signals from the ESC module, it sets U1126.

OBDII Code U1121 - Lost Communication With Electric Stability Program Module - AutoCodes.com
U1121 Code - Lost Communication With Electric Stability Program Module

Need More Information on the Code?

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Information for Specific Makes

  • U1121 Hyundai Lost Communication With Electric Stability Program Module
  • U1121 KIA Lost Communication With Electric Stability Program Module

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Code U1121 comments

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